Package org.apache.calcite.rel.rules

Class JoinProjectTransposeRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.plan.RelRule<JoinProjectTransposeRule.Config>

org.apache.calcite.rel.rules.JoinProjectTransposeRule

All Implemented Interfaces:

TransformationRule

Direct Known Subclasses:

MultiJoinProjectTransposeRule

@Enclosing
public class JoinProjectTransposeRule
extends RelRule<JoinProjectTransposeRule.Config>
implements TransformationRule

Planner rule that matches a Join one of whose inputs is a LogicalProject, and pulls the project up.

Projections are pulled up if the LogicalProject doesn't originate from a null generating input in an outer join.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	JoinProjectTransposeRule.Config	Rule configuration.

Nested classes/interfaces inherited from class org.apache.calcite.plan.RelRule

RelRule.Done, RelRule.MatchHandler<R extends RelOptRule>, RelRule.OperandBuilder, RelRule.OperandDetailBuilder<R extends RelNode>, RelRule.OperandTransform

Nested classes/interfaces inherited from class org.apache.calcite.plan.RelOptRule

RelOptRule.ConverterRelOptRuleOperand

Field Summary

Fields inherited from class org.apache.calcite.plan.RelRule

config

Fields inherited from class org.apache.calcite.plan.RelOptRule

description, operands, relBuilderFactory

Constructor Summary

Constructors

Modifier	Constructor	Description
	JoinProjectTransposeRule(RelOptRuleOperand operand, String description)	Deprecated.
	JoinProjectTransposeRule(RelOptRuleOperand operand, String description, boolean includeOuter, RelFactories.ProjectFactory projectFactory)	Deprecated.
	JoinProjectTransposeRule(RelOptRuleOperand operand, String description, boolean includeOuter, RelBuilderFactory relBuilderFactory)	Deprecated.
	JoinProjectTransposeRule(RelOptRuleOperand operand, String description, RelFactories.ProjectFactory projectFactory)	Deprecated.
protected	JoinProjectTransposeRule(JoinProjectTransposeRule.Config config)	Creates a JoinProjectTransposeRule.

Method Summary

Modifier and Type	Method	Description
protected void	createProjectExprs(@Nullable Project project, RelNode joinChild, int adjustmentAmount, RexBuilder rexBuilder, List<RelDataTypeField> joinChildrenFields, List<Pair<RexNode,String>> projects)	Creates projection expressions corresponding to one of the inputs into the join.
protected RelNode	getProjectChild(RelOptRuleCall call, Project project, boolean leftChild)	Returns the child of the project that will be used as input into the new LogicalJoin once the projects are pulled above the LogicalJoin.
protected Project	getRightChild(RelOptRuleCall call)	Returns the Project corresponding to the right child.
protected boolean	hasLeftChild(RelOptRuleCall call)	Returns whether the rule was invoked with a left project child.
protected boolean	hasRightChild(RelOptRuleCall call)	Returns whether the rule was invoked with 2 children.
void	onMatch(RelOptRuleCall call)	Receives notification about a rule match.

Methods inherited from class org.apache.calcite.plan.RelOptRule

any, convert, convert, convert, convert, convertList, convertOperand, convertOperand, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, operand, operand, operand, operand, operand, operandJ, operandJ, some, toString, unordered

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

JoinProjectTransposeRule

protected JoinProjectTransposeRule(JoinProjectTransposeRule.Config config)

Creates a JoinProjectTransposeRule.

JoinProjectTransposeRule

@Deprecated
public JoinProjectTransposeRule(RelOptRuleOperand operand,
 String description,
 boolean includeOuter,
 RelBuilderFactory relBuilderFactory)

Deprecated.

JoinProjectTransposeRule

@Deprecated
public JoinProjectTransposeRule(RelOptRuleOperand operand,
 String description)

Deprecated.

JoinProjectTransposeRule

@Deprecated
public JoinProjectTransposeRule(RelOptRuleOperand operand,
 String description,
 RelFactories.ProjectFactory projectFactory)

Deprecated.

JoinProjectTransposeRule

@Deprecated
public JoinProjectTransposeRule(RelOptRuleOperand operand,
 String description,
 boolean includeOuter,
 RelFactories.ProjectFactory projectFactory)

Deprecated.

Method Details

onMatch

public void onMatch(RelOptRuleCall call)

Description copied from class: RelOptRule

Receives notification about a rule match. At the time that this method is called, call.rels holds the set of relational expressions which match the operands to the rule; call.rels[0] is the root expression.

Typically a rule would check that the nodes are valid matches, creates a new expression, then calls back RelOptRuleCall.transformTo(org.apache.calcite.rel.RelNode, java.util.Map<org.apache.calcite.rel.RelNode, org.apache.calcite.rel.RelNode>, org.apache.calcite.plan.RelHintsPropagator) to register the expression.

Specified by:

onMatch in class RelOptRule

Parameters:

call - Rule call

See Also:

• RelOptRule.matches(RelOptRuleCall)

hasLeftChild

protected boolean hasLeftChild(RelOptRuleCall call)

Returns whether the rule was invoked with a left project child.

hasRightChild

protected boolean hasRightChild(RelOptRuleCall call)

Returns whether the rule was invoked with 2 children.

getRightChild

protected Project getRightChild(RelOptRuleCall call)

Returns the Project corresponding to the right child.

getProjectChild

protected RelNode getProjectChild(RelOptRuleCall call,
 Project project,
 boolean leftChild)

Returns the child of the project that will be used as input into the new LogicalJoin once the projects are pulled above the LogicalJoin.

Parameters:

call - RelOptRuleCall

project - project RelNode

leftChild - true if the project corresponds to the left projection

Returns:

child of the project that will be used as input into the new LogicalJoin once the projects are pulled above the LogicalJoin

createProjectExprs

protected void createProjectExprs(@Nullable Project project,
 RelNode joinChild,
 int adjustmentAmount,
 RexBuilder rexBuilder,
 List<RelDataTypeField> joinChildrenFields,
 List<Pair<RexNode,String>> projects)

Creates projection expressions corresponding to one of the inputs into the join.

Parameters:

project - the projection input into the join (if it exists)

joinChild - the child of the projection input (if there is a projection); otherwise, this is the join input

adjustmentAmount - the amount the expressions need to be shifted by

rexBuilder - rex builder

joinChildrenFields - concatenation of the fields from the left and right join inputs (once the projections have been removed)

projects - Projection expressions & names to be created